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I did a repair on a 134a reachin couple weeks ago.
Dataplate charge was miniscule, like 11 ozs. It's not
often I work on really small units so like a dummy I inverted the bottle and filled my hoses and manifold.
There went 11 ozs. It was then I wondered just how am
I gonna get exactly 11ozs into the system without wasting that much or more.

Since you are working with R134A you can vapor charge the system and the amount of refrigerant left in the hoses is negligible even on small systems like this.

Dial-a-Charge? I haven't seen one of those in twenty years! I've been using an electronic flat scale that's good to .5 oz and after nearly 15 years it still works well (unless I get it wet)

For liquid charging small systems, just get your charging hose up to tank pressure with the tank upright, invert the tank and zero out your scale. When you get to the required weight, close off at the tank.

Originally posted by icemeister Since you are working with R134A you can vapor charge the system and the amount of refrigerant left in the hoses is negligible even on small systems like this.

For liquid charging small systems, just get your charging hose up to tank pressure with the tank upright, invert the tank and zero out your scale. When you get to the required weight, close off at the tank.